pic.h

实现一个简单的单进程内核,。该内核启用二级虚拟页表映射

/*
 * pic.h
 * Modified for use in 15-410 at CMU
 * Zachary Anderson(zra)
 */

/*
 * Copyright (c) 1995-1999 University of Utah and the Flux Group.
 * All rights reserved.
 * 
 * This file is part of the Flux OSKit.  The OSKit is free software, also known
 * as "open source;" you can redistribute it and/or modify it under the terms
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF).  To explore alternate licensing terms, contact
 * the University of Utah at [e-mail] or [phone].
 * 
 * The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GPL for more details.  You should have
 * received a copy of the GPL along with the OSKit; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */
/*
 * Mach Operating System
 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  [e-mail]
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
Copyright (c) 1988,1989 Prime Computer, Inc.  Natick, MA 01760
All Rights Reserved.

Permission to use, copy, modify, and distribute this
software and its documentation for any purpose and
without fee is hereby granted, provided that the above
copyright notice appears in all copies and that both the
copyright notice and this permission notice appear in
supporting documentation, and that the name of Prime
Computer, Inc. not be used in advertising or publicity
pertaining to distribution of the software without
specific, written prior permission.

THIS SOFTWARE IS PROVIDED "AS IS", AND PRIME COMPUTER,
INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN
NO EVENT SHALL PRIME COMPUTER, INC.  BE LIABLE FOR ANY
SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN ACTION OF CONTRACT, NEGLIGENCE, OR
OTHER TORTIOUS ACTION, ARISING OUR OF OR IN CONNECTION
WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
 * Definitions for the 8259A Programmable Interrupt Controller (PIC)
 */

#ifndef	_PIC_H_
#define	_PIC_H_

#define NINTR	0x10
#define	NPICS	0x02

/*
** The following are definitions used to locate the PICs in the system
** XXX "SLAVES" should be spelled "SLAVE".
*/

#define MASTER_PIC_BASE		0x20
#define SLAVES_PIC_BASE		0xa0
#define OFF_ICW			0x00
#define OFF_OCW			0x01

#define MASTER_ICW		(MASTER_PIC_BASE + OFF_ICW)
#define MASTER_OCW		(MASTER_PIC_BASE + OFF_OCW)
#define SLAVES_ICW		(SLAVES_PIC_BASE + OFF_ICW)
#define SLAVES_OCW		(SLAVES_PIC_BASE + OFF_OCW)

/*
** The following banks of definitions ICW1, ICW2, ICW3, and ICW4 are used
** to define the fields of the various ICWs for initialisation of the PICs
*/

/*
**	ICW1
*/

#define ICW_TEMPLATE		0x10

#define LEVL_TRIGGER		0x08
#define EDGE_TRIGGER		0x00
#define ADDR_INTRVL4		0x04
#define ADDR_INTRVL8		0x00
#define SINGLE__MODE		0x02
#define CASCADE_MODE		0x00
#define ICW4__NEEDED		0x01
#define NO_ICW4_NEED		0x00

/*
**	ICW2 is the programmable interrupt vector base, not defined here.
*/

/*
**	ICW3
*/

#define SLAVE_ON_IR0		0x01
#define SLAVE_ON_IR1		0x02
#define SLAVE_ON_IR2		0x04
#define SLAVE_ON_IR3		0x08
#define SLAVE_ON_IR4		0x10
#define SLAVE_ON_IR5		0x20
#define SLAVE_ON_IR6		0x40
#define SLAVE_ON_IR7		0x80

#define I_AM_SLAVE_0		0x00
#define I_AM_SLAVE_1		0x01
#define I_AM_SLAVE_2		0x02
#define I_AM_SLAVE_3		0x03
#define I_AM_SLAVE_4		0x04
#define I_AM_SLAVE_5		0x05
#define I_AM_SLAVE_6		0x06
#define I_AM_SLAVE_7		0x07

/*
**	ICW4
*/

#define SNF_MODE_ENA		0x10
#define SNF_MODE_DIS		0x00
#define BUFFERD_MODE		0x08
#define NONBUFD_MODE		0x00
#define AUTO_EOI_MOD		0x02
#define NRML_EOI_MOD		0x00
#define I8086_EMM_MOD		0x01
#define SET_MCS_MODE		0x00

/*
**	OCW1
*/

#define PICM_MASK		0xFF
#define	PICS_MASK		0xFF

/*
**	OCW2
*/

#define NON_SPEC_EOI		0x20
#define SPECIFIC_EOI		0x60
#define ROT_NON_SPEC		0xa0
#define SET_ROT_AEOI		0x80
#define RSET_ROTAEOI		0x00
#define ROT_SPEC_EOI		0xe0
#define SET_PRIORITY		0xc0
#define NO_OPERATION		0x40

#define SEND_EOI_IR0		0x00
#define SEND_EOI_IR1		0x01
#define SEND_EOI_IR2		0x02
#define SEND_EOI_IR3		0x03
#define SEND_EOI_IR4		0x04
#define SEND_EOI_IR5		0x05
#define SEND_EOI_IR6		0x06
#define SEND_EOI_IR7		0x07

/*
**	OCW3
*/

#define OCW_TEMPLATE		0x08
#define SPECIAL_MASK		0x40
#define MASK_MDE_SET		0x20
#define MASK_MDE_RST		0x00
#define POLL_COMMAND		0x04
#define NO_POLL_CMND		0x00
#define READ_NEXT_RD		0x02
#define READ_IR_ONRD		0x00
#define READ_IS_ONRD		0x01


/*
**	Standard PIC initialization values for PCs.
*/
#define PICM_ICW1	(ICW_TEMPLATE | EDGE_TRIGGER | ADDR_INTRVL8 \
			 | CASCADE_MODE | ICW4__NEEDED)
#define PICM_ICW3	(SLAVE_ON_IR2)
#define PICM_ICW4	(SNF_MODE_DIS | NONBUFD_MODE | NRML_EOI_MOD \
			 | I8086_EMM_MOD)

#define PICS_ICW1	(ICW_TEMPLATE | EDGE_TRIGGER | ADDR_INTRVL8 \
			 | CASCADE_MODE | ICW4__NEEDED)
#define PICS_ICW3	(I_AM_SLAVE_2)
#define PICS_ICW4	(SNF_MODE_DIS | NONBUFD_MODE | NRML_EOI_MOD \
			 | I8086_EMM_MOD)


extern void pic_init(unsigned char master_base, unsigned char slave_base);
extern void pic_disable_irq(unsigned char irq);
extern void pic_enable_irq(unsigned char irq);
extern int pic_test_irq(unsigned char irq);
extern int pic_get_irqmask(void);
extern void pic_set_irqmask(int mask);

#include <x86/pio.h>

#define pic_enable_all() ({		\
	outb(MASTER_OCW, 0);		\
	outb(SLAVES_OCW, 0);		\
})

#define pic_disable_all() ({		\
	outb(MASTER_OCW, PICM_MASK);	\
	outb(SLAVES_OCW, PICS_MASK);	\
})

#define pic_ack(irq) ({				\
	outb(MASTER_ICW, NON_SPEC_EOI);		\
	if ((irq) >= 8)				\
		outb(SLAVES_ICW, NON_SPEC_EOI);	\
})

#endif	/* _PIC_H_ */